I very much enjoy this letterhead design by Anton Stankowski. The grid-based structure and asymmetrical layout create a really interesting visual. This letterhead is part of James Phillips Williams’ collection that he often features on his blog, Amass. Check out the site, it’s a keeper. He also owns another gorgeous letterhead that was designed by Herbert Bayer.
If you want more letterhead goodness, head over to the blog Letterheady. The site features a ton of excellent letterhead designs of well known figures like Babe Ruth and Henry Ford. My personal favorites are the letterheads of Houdini and Charlie Chaplin. I can surf this site all day long.